The Echinoid Directory

• Test ovate with distinct anterior sulcus; posterior face truncate and slightly undercut. Test depressed in profile.
• Apical disc ethmolytic with four gonopores; a little anterior of centre.
• Anterior ambulacrum narrow and weakly sunken from apex to peristome (deepest at ambitus). Pore-pairs small and undifferentiated.
• Paired ambulacra petaloid; posterior pair slightly longer than anterior pair and flexed outwards distally. Petals long, parallel-sided and sunken, with narrow interporal zone.
• Peristome kidney-shaped with projecting labrum.
• Labral plate short and wide; not extending beyond ambulacral plate 1. Sternal plates elongate; episternal plates forming part of plastron. Sternal-episternal suture strongly convex towards anterior.
• Periproct on posterior truncate face.
• Subanal fasciole present; shield-shaped; with anal branches.
• Peripetalous fasciole present; narrow; indented behind anterior petals.
• Aboral tuberculation heterogeneous inside peripetalous fasciole.

Recent; Indo-Pacific.

Brissus maculosus, Desmoulins, 1837, p. 228 [=Echinus spatagus Linnaeus, 1758, p. 665], by original designation.

Spatangoida, Micrasterina, Brissidae.

Subjective junior synonym of Metalia Gray, 1855.

There are no differences of significance between this taxon and Metalia.